Elfonía was an experimental rock band with elements of progressive and ambient music. It was founded by Alejandro Millán and Marcela Bovio in 2001 following the leaving of their previous band, Hydra. The band's line-up was extended in 2003 for purposes of a major music festival held in Monterrey, Mexico with Roberto Quintanilla on lead guitar, Pablo González on bass guitar and Javier Garagarza on drums. By the end of the year, Elfonía independently produced their self-titled first studio album which marked their breakthrough into mainstream music. In November 2003, Marcela was invited by Arjen Anthony Lucassen to perform vocals on Ayreon's album The Human Equation.